SIM LAB DESCRIPTION
Once you do
this you will not be able to do more experiments. Now you
can perform the fit to a line. Click on "Perform Linear
Fit" and the simulation will fit a line to your data
points. Note that the line intersects zero response at zero
dosage; the linear fit assumes no threshold to the response.
The dose response display will now show your data points and
the line that is fit to them. Your next task it to estimate
the dosage corresponding to a 0.1% response. The simulation
helps you do this. If you expand the scale on the graph by
clicking on the "Expand Scale" button, you will
see that the simulation has drawn a horizontal line connecting
the 0.1 dosage level with the (linear) dose response curve.
The dosage corresponding to this level is connected to the
dose response curve by a vertical line. The vertical and horizontal
lines form a rectangle at the lower left of the dose response
display and the line fit to the data will pass diagonally
across the rectangle. The answer you want for the dosage is
at the vertical line. Read the value off the horizontal scale
at the bottom (estimating by eye as best you can when the
dosage is between tick marks as it almost always is). Enter
this dosage into the box "Estimated Dose" and push
"Submit".
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